UCPX14 bearing: complete specifications & equivalents
The UCPX14 is a JIS B 1559 radial bearing sized 70 x 150 x 77.8 mm (bore x OD x width) with 2RS sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 70 mm |
| Outer diameter D | 150 mm |
| Width B | 77.8 mm |
| Seal / shield | 2RS |
| Basic dynamic load rating C | 73.5 kN |
| Basic static load rating C0 | 49.5 kN |
| Fatigue load limit Pu | 3.8 kN |
| Mass | 9300 g |
| Housing height H | 88.9 mm |
| Housing overall length L | 330 mm |
| Mounting bolt center distance J | 229 mm |
| Mounting hole diameter N | 27 mm |
| Manufacturer designation | UCPX14 |
| Standard | JIS B 1559 |
| Catalog version | CAT. No. 2203-3/E 2024 |
| Last verified | 2026-09-25 |
Source: catalog reference (CAT. No. 2203-3/E 2024) · extracted 2026-09-25
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (CAT. No. 2203-3/E 2024); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.com.
Dimensions in inches & UCP-series range
| Bore d | 2.756 in |
|---|---|
| Outer diameter D | 5.906 in |
| Width B | 3.063 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 40 mm |
| Smallest bore in UCP-series | 12 mm |
| Largest outer diameter in UCP-series | 300 mm |
| Width range across UCP-series | 31–145 mm |
| Bore position in UCP-series (smallest first) | 14 of 25 |
| Bore above smallest UCP-series size | 58 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| UCPX14 | ISO 15 | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range. Brand-specific OEM equivalents pending multi-source data. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the UCPX14 model number is decoded
UCPX14 belongs to NTN's UCP line of cast-iron pillow blocks built to JIS B 1559 housing boundary dimensions around a JIS B 1558 UCX14D1 insert. The code breaks down as insert family UC, housing form P (pillow block), duty series X, bore code ending in the 70 mm shaft size; the unit is built from insert UCX14D1 and housing PX14. For layout work on UCPX14: the 70 mm shaft centre sits 88.9 mm above the sole (H), the footprint is 330 mm long (L), bolt centres are 229 mm (J), and the foot holes suit M22 (27 mm) bolts. The X section is NTN’s intermediate-duty build: a wider UCX insert with a higher rating sits in a longer, sturdier housing than the 2-series unit at the same bore. The upright base carries the shaft parallel to and above the mounting surface, which is the arrangement fan, conveyor and transmission drives use whenever a plinth or rail is available. At 55–90 mm bore the units carry serious conveyor, fan and crusher-feed drives; housing stiffness, foundation condition and bolt torque matter as much as the insert rating. Sugar and fertiliser handling relies on this unit where corrosion and fine crystals attack everything: the sealed insert and the grease nipple let crews purge contaminated grease after each campaign. Check the shaft itself is straight to roughly 0.05 mm over the bearing centres before blaming a noisy new unit: mounted bearings accept housing misalignment but cannot offset a bent shaft. Basic ratings of the UCX14D1 insert are 73.5 kN dynamic and 49.5 kN static; the assembled UCPX14 weighs about 9.3 kg.
Typical equipment & failure modes
Common applications
- cement and clinker handling
- sugar-mill and fertiliser plant drives
- heavy bulk-handling conveyors
- washdown-duty food and pharmaceutical areas using purge relubrication
Known failure patterns
- setscrew loosening and inner-ring fretting on a shaft that was never re-torqued after run-in
- insert brinelling from hammer mounting or from belt tension applied to a stationary unit
- over-greasing that churns the charge, overheats the bearing and blows the seal lip
Selection pitfalls — read before you substitute
- The X insert of UCPX14 is wider and rated above the 2-series part at 70 mm, but it is not interchangeable with a 3-series unit in a damaged application — check the housing length and bolt centres before swapping.
- As a pillow block, UCPX14 needs a prepared horizontal surface at the 88.9 mm centre height: shim both feet with full-width packs so the 330 mm base seats over its full area.
- When ordering covers for UCPX14, note the steel and cast-iron cover executions change the unit mass and envelope but not the 229 mm mounting centres.
- At 70 mm bore the 330 mm base of UCPX14 is a structural member: grout or machine the foundation, because a bedded-on-edges housing concentrates the full belt pull on two cast feet.
Frequently asked questions
What are the dimensions of an UCPX14 mounted bearing?
UCPX14 takes a 70 mm shaft (insert UCX14D1, 150 mm OD) and has a unit mass of about 9.3 kg. Housing figures: centre height H 88.9 mm, length L 330 mm, bolt centres J 229 mm, foot holes 27 mm for M22 bolts.
What does the UCPX14 designation mean?
UC identifies the wide-inner-ring, setscrew-locking ball bearing insert; P the upright pillow block housing; X is the duty series; the last digits encode the 70 mm bore. UCPX14 is built from housing PX14 plus insert UCX14D1 (D1 = greasable).
How is UCPX14 locked to the shaft, and how tight should the setscrews be?
The UCX14D1 insert uses two collar setscrews on the 70 mm shaft. Tighten them to NTN's torque table for this bore size in sequence — half torque on the first, full on the second, then back to the first — and re-torque after the first 24–48 running hours once the collar has seated.
When should I choose a pillow block like UCPX14 instead of a flanged unit?
Choose the UCPX14 pillow block when the shaft runs parallel to a horizontal base plate, rail or plinth — the upright housing holds the shaft centre 88.9 mm above the 330 mm bolt-down base. Choose a UCFL flange when the shaft meets a vertical frame face and the housing bolts flat against it.
Reviewed & verified by the MPN Base engineering desk against source catalog CAT. No. 2203-3/E 2024 on 2026-09-25. Read our editorial & correction policy.